LPMIM · ENGINEERING RESOURCES

Brass and Copper Conversion: Cost Evaluation Checklist

Evaluate a material or process conversion using cost per accepted component, not metal price per kilogram alone. Include tooling, secondary operations and qualification. Conductivity, corrosion and dimensional requirements can outweigh a lower manufacturing cost.

Build a like-for-like cost comparison

Build a like-for-like cost comparison
Cost itemCurrent routeProposed MIM route
Fixed investmentFixtures, setup and qualificationMold, supports, fixtures and qualification
MaterialPurchased stock less recoverable scrap valueFeedstock and processing losses
ProcessingCurrent operations, handling and cycle timesMolding, debinding, sintering and secondary operations
QualityInspection, scrap and rework per accepted partFirst articles, inspection, scrap and rework
Delivery and changePackaging, logistics, inventory and revision costsEquivalent delivered scope and tooling change allowance

Understand the break-even calculation

Break-even quantity = (MIM fixed cost − current-route fixed cost) ÷ (current-route variable cost per accepted part − MIM variable cost per accepted part).

Use this simplified comparison only when its inputs refer to the same part requirements and cost scope. If recurring MIM cost is not lower, there is no positive payback on a higher MIM fixed investment in this model. A lower fixed investment requires a different crossover interpretation.

Demand changes, tool maintenance, qualification delays and financing can change the result. This checklist is not a quotation or a live commodity-price forecast.

What to gather before asking for a quote

  • Current material and process, including secondary operations.
  • Drawings, critical interfaces and allowable design changes.
  • Annual demand, batch size and expected program life.
  • Inspection requirements, current yield and delivered cost scope.
  • Conductivity, corrosion, temperature and load requirements.
Contents